Strangely, without my doing anything, it's appearing in the menus now. If I have remembered this correctly I think it was there upon the first boot up following the last lot of system updates so something shook loose there, however, I'm going to post this issue slightly differently in another section of the forums now as VirtualBox specifically was not the issue. I'm now having more of the same problem where 3 out of the last 5 items haven't shown up in the menus either.Thanks for your help.